GSO 2\" 90-deg 99% Quartz Dielectric Mirror Diagonal for SCT Telescope For Sale
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GSO 2\" 90-deg 99% Quartz Dielectric Mirror Diagonal for SCT Telescope:
$0.99
Taken out of box for testing a couple of times on my telescope, but did not use afterwards. Kept stored with lens caps on in original packaging the whole time. Never touched or attempted to clean any optical surfaces. This is in mint condition optically and cosmetically.